Water tube steam generator



WATER TUBE STEAM GENERATOR Filed Nov. 13, 1924 3 sheets-sheet 1INVENTOR.

Mil/442;;

A TTORNEYS.

July 14, 1931. E. w. JONES 1,314,447

v WATER TUBE STEAM GENERATOR Filed Nov. 13, 1924 3 Sheets-Sheet 2INVENTOR.

BY a I 76 ATTORNEYS.

July 14, 1931. E. w. JONES 1,314,447

WATER TUBE STEAM GENERATOR Fi l ed Nov. 15, 1924 3 Sheets-Sheet 3INVENTOR fl y ATTORNEYS Patented July 14, 193i UNITED ST EDWIN WALTERJONES, OF LINCOLN, ENGLAND, ASSIGNGR TO THE BABCOCK 8c WILCOX COMPANY,OF BAYONNE, NEW JERSEY,

A CORPORATION or new JERSEY WATER TUBE STEAM GENERATOR Applicationfiled'November 13, 1924, Serial No. 749,578, and Great Britain November23, 1923.

tubes, and Fig. i isaplan'view partiallyein.

section of the boiler illustrated in l,

and showing in adiagrammatic manner andin plan the aisle space betweenthe two boilers; I Y

In carrying theinvention into effect according to the form shown in Fig.1, the

Water tubes at of thelowerbank are arranged immediately above thefurnace b and extend in a longitudinal direction substantially the wholelength of the-boiler from frontto back, the tubes being inclined upwardin a direction from back to front and connected to vertical headers c, dat each end respectively; The tubes ofthe lower bank a are preferablyexposed for substantially their entirelength' to the radiant heat-of thefurnace;

Above this first bank of tubes at the front end of theboiler a secondbank is arranged containing, for example, ten rows of tubes 6 of shorterlength than tubes or, running from front to back, individual tubes beingarranged oneabove the other in vertical planes and preferably inclinedatthe same angle as the tubes a in the lower bank. At the front endoftheboiler these tubes are con nected to extensions f of the correspondingheaders (Z of the lower bank, these headers being thus common to bothbanks, While at the other end the tubes 6 are connected tovertical'headers it placed at about the position of'thefirstvertica'lba'ffle as ordinarily arranged in this type of boiler, so thatthe length of the upper bank of tubes 0 corresponds to about thatoccupied by the usual first pass of the furnace gases.

Therear vertical headersh are in turn respectively connected by shortlengths of tube 2' to a transverse distributor or feed-box k which, mayvery conveniently act as a cross beaincarrying the upper bank oftubes,appropriate provision being providedfor the free expansion of thelatter.

Above the front headers f ofrthe upper bank of tubes a transverse steamand Water drum on. is arranged to whichthese headers are connected,while according to one arrangement a series of tubes at acting asdowncomers andv arranged in a direction generally parallel to thewatertubes 0, connects this drum to the rear headers h of the upper bank, alongitudinal baiille 0 being arranged if desired in the transverse drumon between the line of connections to the front headers f and the lineof downcomers a,

above mentioned,

At the rear of the boiler a second or main steam and water drum 1, aboutthe same level as the first, is arranged in a transverse direction, twoseries of tubes 8, t connecting the two, drums, the tubes .9 of oneseries connecting the steam spaces and the tubes t of the second seriesconnecting the water spaces.

Finally a seriesof downcomersu connects the second or main transversesteam and water drum 7 at the rear of the boiler to the respective rearheaders 0 of the lower bank of water tubes a.

Preferably a battle '0 covers the rear portion of the lower bank ofwater tubes (1- and extends from the rear of the boiler preferablysubstantially parallel to the tubes of the lower bank to a pointslightly to the front of the rear headers h ofthe upper bank, the baffleat its front end being vertical for a short distance, as shown.

It will be seen from the above description that a large space is leftabove the lower bank of tubes in the rear part of the boiler and in thisspace according to the present invention an economizer, indicated. as awhole by the arrowcd letter A, is arranged consisting of a series ofvertical headers to connectedby slightly inclined tubes 00 (see Fig. 2arranged in a transverse direction in relation to the boiler. To assistin the replacing of tubes in the economizer, the

headers w at one end (see Fig. 2) are made L-shaped in cross section,the Us being arranged as it were in pairs back to back so that spaces 2are provided for the reception of the ends of the tubes when assemblingthem in place; in this figure the tube as by help of a space a, has beenlifted vertically into its approximate position, the tube 41: beingshown as partly inserted. A space B is preferably left at the rear ofthe economizer so that in conjunction with an appropriate door 9 at theside of the boiler at the lower end of the economizer, a tube may beangled into or out of the position 00 no withstanding a narrowpassageway between the adjacent boilers of a battery. It will beunderstood that when the width of the aisle space between two adjacentboiler units is less than the length of a tube, that the tube willnecessarily be held at an angle to the positions of the tubes in theeconomizer in order. to remove the tube through the door in the sidewall.

In some cases in addition to the econos mizer a superheater is fittedwhich may conveniently take the following form A transverse header ordistributor 2 receiving the steam from the main steam and water drum 1"by way of the steam pipe 3, is connected to a series of tubes 4 whichpass singly or in groups through the spaces or lanes between adjacentvertical rows of water tubes 6 in the upper bank, these tubes preferablypassing downward at an angle in relation to the water tubes 6 and being.

in staggered relation to one another. The superheater tubes so disposedare connected to a second transverse header or collector 5, arranged atthe lower end of the rear headers h of the second bank of water tubesand somewhat to the rear thereof, the disposition of this collectorheader being such that it lies within the angle formed by the two partsof the baffle 12, above described, so that it is well protected from thedirect heat of the furnace, while at the same time accessible throughany "appropriate opening for examination.

An alternative arrangement of the superheater tubes 4 is shown in Fig.3, additional loops or bends l being disposed above the upper banks ofwater tubes 6.

The general course of the working fluid in the boiler described above isas follows The feed entering the lower end of the economizer A passessuccessively through the vertical rows of tubes 00 toits outlet at thetop of the front of the economizer, a connection 6 passing thence to thetransverse feed-box above the vertical rear headers h of the upper bankof water tubes. Owing to the upward slope of these tubes, as evaporationtakes place, the working fluid passes to the front headers f where itmixes with steam from the lower bank, the

admixture passing into the front transverse drum m and thence to themain drum 9 at the rear of the boiler. From here the steam passesthrough the angled tubes l of the superheater described above to thecollector header 5 and thence to the main steam pipe. Circulation is setup in the boiler as follows: From the drum on the water passes throughthe tubes 25 to the drum 7", then through tubes at to headers 0 andthrough the tubes 4; and headers back to the drum It will be seen aboiler of the present invention is unusually compact and that advantageis taken of the well-known fact that in boilers of this general type,the tubes or parts of the tubes with which the hot gases first come intocontact are more efiicient than the tubes or parts of the tubes moreremote from the furnace, the evaporating power of such latter tubesbeing very considerably reduced.

It will also be seen that with a boiler so constructed the 'usualtransverse brick bullies, which are difficult to inspect and repair, areeliminated, while the whole arrangement is very compact and a saving iseffected in the brickwork, casing, fan

trunks and so forth, while owing to the compactness radiation losses arereduced.

The boiler described may be fitted with all the usual auxiliaries forefficient working, the rear headers, for example, of the two banks oftubes being connected respectively to bottom transverse mud-boxes 7, 8,while blowers, dampers and access doors are provided as required.

Instead of the economizer an air heater may be provided, while the feedmay in some cases be led from the economizer di rect to the front drum;in addition modifications in the details of construction above describedmay be made without exceeding the scope of the underlying inventiveidea.

It will, of course, be understood. that in place of the rows of headers0, (Z, 7, and which are illustrated, asingle water chamber could be usedin .placeof each row. When I refer in certain claims, therefore, to awater chamber, it is understood that the expression is intended to covereither a single water chamber or a row of headers such as illustrated inthe drawings.

I claim: r

1. In a water-tube boiler, a lower bank of horizontally inclined watertubes, a second bank of tubes above said lower bank, said second bankbeing of less extent lengthwise of the tubes of said lower bank, achamber being formed above said lower bank and at the rear of saidsecond bank of tubes, a steam and water drum, heat transferring meansother than a superheater located in said chamber, supply means for saidupper above said lower bank and at the rear of said second bank oftubes, heat transferring means other than a superheater located in saidchamber, and superheater tubes in the lanes between vertical rows oftubes of said upper bank.

3, In a water tube boiler, a lower bank of horizontally inclined watertubes, a sec-- ond bank of water tubes located above and extending inthe same general direction as the tubes of said lower bank, said secondbank being of less extent lengthwise than said lower bank, a chamberdefined in part by said second bank of tubes and located above saidlower bank of tubes, a steam and water drum, connections for creating acirculation from said drum through the tubes of said lower and saidsecond banks, and a heat transfer device located in said chamber. 1

4L. In a water tube boiler, a lower bank of horizontally inclined watertubes, a second bank of water tubes located above and extending in thesame general direction as the tubes of said lower bank, said secondbankbeing of less extent lengthwise than said lower bank, a chamber definedin part by said second bank of tubes and located above said lower bankof tubes, a steam and water drum, connections for creating a circulationfrom said drum through the tubes of said lower and said second banks,and a heat transfer device comprising tubes located in said chamber, thetubes of said heat transfer device extending transversely of those ofsaid lower bank.

5. In a water tube boiler, a lower bank of horizontally inclined watertubes, a second bank of water tubes located above and of less extentlengthwise than the tubes of said lower bank, a chamber being formedabove said lower bank of tubes and at the rear of said upper bank, asteam and water drum, a heat transfer device located in said chamber,supply means for said upper and lower banks of tubes, and a commonheaderconnected to said steam and water drum, to which header tubes of saidlower bank and of said second bank are connected.

6. I11 combination, a furnace, a water tube boiler comprising a lowerbank of inclined water tubes located above said furnace and exposed forsubstantially their entire length to radiant heat of said furnace, abaflie located above and substantially parallel to said bank andextendingfrom one: endiiof the" bank; partially of: theilengtha' thereofto: leave an :unbafliedt. portion= ofwthe lowerxbank, a;seconjdpupperbank of tubes; shorter than said lower bank and;extending:v in the same 2 general direction as the tubes ofv the lowerbank, said upperbank of tubes beingqlocated above. the unbafiied portiononly of the lower bank,1the.- flow of gases over said upper bank being:unrestricted/exceptiby said tubes.

7'. In: combinatiomaa steam boiler compris-r ing a steam and watersdrum,a lower bank-v ofuinclinedx watertubes, an'upper bank: of 7 water-ftubes. located: above the. lower bank and extending in the same generaldirection but shorterthanwthe tubes? of the lower bank, said upper andlowerbanksxof tubes? being; connected toindependenta headers at oneendand to a common header at the other: end, said: common header beingcon-.

nected to said. steam and water drum, and:

tubes'connecting said stea1n: andlwater drum to the independent headerfor said second bank of water tubes, said drum being provided with abaffle extending longitudinally thereof and located between theconnection of said common header and said last-named tubes to the saiddrum.

8. In a water tube boiler, an upper drum, a lower bank of straightinclined water tubes connected at one end to a common water chamber, andat their other ends to an independent water chamber, connections leadingfrom said Water chambers to said drum, a second upper bank of inclinedwater tubes substantially parallel to and shorter than the tubes of thelower bank, the major portion of the tubes of said upper bank beingconnected at one end to said common water chamber and at their otherends to an intermediate water chamber located intermediate the planes ofsaid common water chamber and the first mentioned independent waterchamber, all of said water chambers being upwardly extending, a chamberbeing provided at the rear of the intermediate water chamber to whichthe tubes of the upper bank are conneoted and above the tubes of thelower bank, and an economizer located in said chamber.

9. In a water tube boiler, a drum, a lower bank of straight inclinedwater tubes connected at one end to a common water chamber and at theirother ends to an independent water chamber, connections leading fromsaid water chambers to said drum, a second upper bank of inclined watertubes substantially parallel to and shorter than the tubes of the lowerbank, the tubes of said upper bank being unbafiled, the major portion ofthe tubes of said upper bank being connected at one end to said commonwater chamber and at their other ends to an intermediate water chamberlocated intermediate the planes of said common water chamber and thefirst mentioned independent water chamber, all of said water chambersbeing upwardly vextending, a chamber being provided at the rear of theintermediate Waterchambers to which the tubes of the uppervbank areconnected and above the tubes of the lower bank, and an economizerlocated in said chambeix,

10. In combination, a steam boiler comprising a drum, a lower bank ofinclined water tubes, an upper bank of water tubes located above thelower bank and extending in the same general direction but shorter thanthe tubes of the lower bank, said lower bank of tubes and some of thetubes of the upper bank being connected to independent water chambers atone end and to a common water chamber at the other end, other tubes ofsaid upper bank being connected to the Water space of said drum and tothe independent water chamber for said upper bank.

EDWIN WVALTER JONES.

